“Life Day was a Wookiee holiday celebrated by the inhabitants of Kashyyyk every three years. It was a celebration of the planet‘s diverse ecosystem and the many forms of life it encompassed. It also was a time to remember family members who had died, and the young ones who continued to bring new life to a family. Life Day was a sacred holiday, and many Wookiees considered it their duty to return to Kashyyyk in order to celebrate it. Life Day was held once every three local years for many generations, but during the Galactic Civil War, its importance to the Wookiees became more pronounced. Wookiees were spread across the galaxy, either because they had been enslaved by the Galactic Empire or for personal reasons, and they began celebrating Life Day each year as a way to remain in touch with their history. Over time, the holiday found its way into various other cultures. “Life day” was also used as a term to describe the anniversary of one’s birth.” – Wookieepedia: The Star Wars Wiki http://starwars.wikia.com/wiki/Life_Day